From the Editor - The Internet Protocol Journal, Volume 12, No.1

IP Version 4 address exhaustion and migration to IP Version 6 continues to be the focus of many Internet-related organizations and events. The Regional Internet Registries (RIRs), still debating what will happen as the IPv4 address pool runs out, are developing policies for how to manage address-block transfers between address holders. One potential result of the address shortage is that a market (official or otherwise) will develop for the buying and selling of IPv4 addresses. In our last issue, we brought you the first in a two-part series of articles entitled "The End of Eternity," by Niall Murphy and David Wilson. Part Two, included in this issue, discusses what a market-based IP trading exchange might look like.

IP address allocation, transfers, and even the potential trading market for addresses is ultimately dependent on a reliable and trusted registry for this information. The RIRs have been working on a way to ensure that information about IP Number Resources (that is, IPv4 addresses, IPv6 addresses, and Autonomous System [AS] numbers) are securely stored and distributed so that users of such information can be assured that it is authentic. The underlying technology is a Resource Certificate Public Key Infrastructure (RPKI), and it is described in our second article by Geoff Huston.

The Internet technical community is discussing the so-called identifier/ locator split as a major change to the Internet architecture. The IETF is developing several proposals, including the Locator Identifier Separation Protocol (LISP) discussed in our March 2008 issue. In this issue we look at another proposal, the Host Identity Protocol (HIP). The article is by Andrei Gurtov, Miika Komu, and Robert Moskowitz.

You will notice that our back cover has a new look. This layout is not the result of any creative design urges, but rather a change in U.S. Postal Service regulations regarding the placement of the subscriber address label. I guess the Internet isn’t the only place where addressing is a major topic.

As always, your comments, suggestions, and contributions are wel-come, including Letters to the Editor, Book Reviews, and of course full-length articles. Our Call for Papers is included on page 35. Contact us by e-mail at

—Ole J. Jacobsen, Editor and Publisher